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Sources/firmware-utils/src/iptime-crc32.c

  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright (c) 2021 Sungbo Eo <mans0n@gorani.run>
  4  *
  5  * This code is based on mkdhpimg.c and mkzcfw.c
  6  * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
  7  * Copyright (c) 2016 FUKAUMI Naoki <naobsd@gmail.com>
  8  *
  9  * Checksum algorithm is derived from add_iptime_fw_header.c
 10  * Copyright (C) 2020 Jaehoon You <teslamint@gmail.com>
 11  */
 12 
 13 #include <byteswap.h>
 14 #include <endian.h>
 15 #include <err.h>
 16 #include <errno.h>
 17 #include <fcntl.h>
 18 #include <stdint.h>
 19 #include <stdio.h>
 20 #include <stdlib.h>
 21 #include <string.h>
 22 #include <sys/stat.h>
 23 #include <unistd.h>
 24 
 25 #include "cyg_crc.h"
 26 
 27 #if !defined(__BYTE_ORDER)
 28 #error "Unknown byte order"
 29 #endif
 30 
 31 #if (__BYTE_ORDER == __BIG_ENDIAN)
 32 #define HOST_TO_LE32(x) bswap_32(x)
 33 #elif (__BYTE_ORDER == __LITTLE_ENDIAN)
 34 #define HOST_TO_LE32(x) (x)
 35 #else
 36 #error "Unsupported endianness"
 37 #endif
 38 
 39 #define FW_VERSION      "00_000"
 40 
 41 struct fw_header {
 42         uint8_t model[8];
 43         uint8_t version[8];
 44         uint8_t reserved[32];
 45         uint32_t size;
 46         uint32_t checksum;
 47 } __attribute__ ((packed));
 48 
 49 struct board_info {
 50         const char *model;
 51         size_t payload_offset;
 52 };
 53 
 54 struct board_info boards[] = {
 55         { .model = "ax2004m", .payload_offset = 0x38 },
 56         { .model = "ax8004m", .payload_offset = 0x38 },
 57         { /* sentinel */ }
 58 };
 59 
 60 struct board_info *find_board(const char *model)
 61 {
 62         struct board_info *ret = NULL;
 63         struct board_info *board;
 64 
 65         for (board = boards; board->model != NULL; board++) {
 66                 if (strcmp(model, board->model) == 0) {
 67                         ret = board;
 68                         break;
 69                 }
 70         }
 71 
 72         return ret;
 73 }
 74 
 75 uint32_t make_checksum(struct fw_header *header, uint8_t *payload, int size)
 76 {
 77         cyg_uint32 checksum;
 78 
 79         /* get CRC of header */
 80         checksum = cyg_crc32_accumulate(~0L, header, sizeof(*header));
 81 
 82         /* get CRC of payload buffer with header CRC as initial value */
 83         return (uint32_t)cyg_crc32_accumulate(checksum, payload, size);
 84 }
 85 
 86 void make_header(struct board_info *board, uint8_t *buffer, size_t img_size)
 87 {
 88         struct fw_header *header = (struct fw_header *)buffer;
 89         uint32_t checksum;
 90 
 91         strncpy((char *)header->model, board->model, sizeof(header->model)-1);
 92         strncpy((char *)header->version, FW_VERSION, sizeof(header->version)-1);
 93         header->size = HOST_TO_LE32(img_size);
 94         checksum = make_checksum(header, buffer + board->payload_offset, img_size);
 95         header->checksum = HOST_TO_LE32(checksum);
 96 }
 97 
 98 int main(int argc, const char *argv[])
 99 {
100         const char *model_name, *img_in, *img_out;
101         struct board_info *board;
102         int file_in, file_out;
103         struct stat stat_in;
104         size_t size_in, size_out;
105         uint8_t *buffer;
106 
107         if (argc != 4) {
108                 fprintf(stderr, "Usage: %s <model> <input> <output>\n", argv[0]);
109                 return EXIT_FAILURE;
110         }
111         model_name = argv[1];
112         img_in = argv[2];
113         img_out = argv[3];
114 
115         board = find_board(model_name);
116         if (board == NULL) {
117                 fprintf(stderr, "%s: Not supported model\n", model_name);
118                 return EXIT_FAILURE;
119         }
120 
121         if ((file_in = open(img_in, O_RDONLY)) == -1)
122                 err(EXIT_FAILURE, "%s", img_in);
123 
124         if (fstat(file_in, &stat_in) == -1)
125                 err(EXIT_FAILURE, "%s", img_in);
126 
127         size_in = stat_in.st_size;
128         size_out = board->payload_offset + size_in;
129 
130         if ((buffer = malloc(size_out)) == NULL)
131                 err(EXIT_FAILURE, "malloc");
132 
133         read(file_in, buffer + board->payload_offset, size_in);
134         close(file_in);
135 
136         memset(buffer, 0, board->payload_offset);
137 
138         make_header(board, buffer, size_in);
139 
140         if ((file_out = creat(img_out, 0644)) == -1)
141                 err(EXIT_FAILURE, "%s", img_out);
142         write(file_out, buffer, size_out);
143         close(file_out);
144 
145         free(buffer);
146 
147         return EXIT_SUCCESS;
148 }
149 

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